Which statement best describes a human influence on the biogeochemical cycles?
a. increased eutrophication caused by high levels of nitrogen and phosphorous
b. increased nitrates available due to inaccurate methods of denitrification
c. increased global warming due to alternative energy sources
d. increased amount of water that is available to freshwater ecosystems

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit

Name the tissue that in translocation

Which substance is a greenhouse gas that is emitted by human activities, is the most widespread, and remains in the air the longest?